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major reference

…hues or juxtaposed with its complementary colour. Complementaries are colour opposites. The complementary colour to one of the primary hues is the mixture of the other two; the complementary to red pigment, for example, is green—that is, blue mixed with yellow. The colour wheel shows that the tertiaries also have…

nonspectral colour measurement

…of approximately equal intensities of complementary colours (colours that are diametrically opposed on the colour circle), such as yellow and blue-violet, green and magenta, or cyan and red. Intermediate colours can be produced by mixing light beams, so mixing red and yellow gives orange, red and blue-violet gives magenta, and…

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